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Lennox · humidifier

Lennox HCWP3-18 replacement filter

Use part X2661. Replace annually or if performance drops.

The filter that fits

Maker lists this model

Lennox X2661 (#35) water panel

Healthy Climate #35 Replacement Humidifier Water Panel

Part number
X2661
How many
1 per unit
How often
Replace annually or if performance drops
Size
10 x 13 x 1-3/4 in
Buy X2661 (#35) water panel on AmazonManufacturer page

Opens an Amazon search for Lennox X2661 (#35) water panel. Check the listing says X2661.

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Does your exact model share this filter?

Lennox labels several versions of the HCWP3-18. Check the label on your unit.

  • HCWP3-18 takes X2661
  • HCWP3-18A same filter
  • HCWP18 not confirmed by Lennox · Current model name; lennox.com's HCWP18 page links the same manual

Sources

High confidence: the manufacturer names this exact model on a live page. Each line is the page we read and the day we read it.

  • Which filter fits lennoxpros.com Maker's own page checked Oct 1, 2026
    Lennox X2661, Healthy Climate #35 Humidifier Water Panel ... Replacement Humidifier Pad for Healthy Climate Humidifiers: HCWB2-17, HCBW2-17A, HCWB3-17, HCBW3-17A, HCWP2-18, HCWP2-18A, HCWP3-18, HCWP3-18A
  • How many lennox.com Maker's own page checked Oct 1, 2026
    Lennox Healthy Climate humidifier operating manual (form 10009367, 04/2011; covers HCWB3-12, -12K, -12A, -12AK, HCWB3-17, -17K, -17A, -17AK, HCWP3-18 and HCWP3-18A), linked from lennox.com's current HCWB17 and HCWP18 pages, maintenance steps slide the single humidifier pad out of the scale control insert and insert a new one
  • How often lennox.com Maker's own page checked Oct 1, 2026
    Lennox Healthy Climate humidifier operating manual (form 10009367, 04/2011; covers HCWB3-12, -12K, -12A, -12AK, HCWB3-17, -17K, -17A, -17AK, HCWP3-18 and HCWP3-18A), linked from lennox.com's current HCWB17 and HCWP18 pages, PDF p4: 'For best performance, you should replace the humidifier pad in your humidifier at least annually' ... 'Replace Humidifier Pad annually or if performance drops'
  • Size lennoxpros.com Maker's own page checked Oct 1, 2026
    Additional Information 10" W x 13" H x 1-3/4" D
Show all 5 sources

Which filter fits

  1. lennoxpros.com Maker's own page checked Oct 1, 2026
    Lennox X2661, Healthy Climate #35 Humidifier Water Panel ... Replacement Humidifier Pad for Healthy Climate Humidifiers: HCWB2-17, HCBW2-17A, HCWB3-17, HCBW3-17A, HCWP2-18, HCWP2-18A, HCWP3-18, HCWP3-18A
  2. lennox.com Maker's own page checked Oct 1, 2026
    Lennox Healthy Climate humidifier operating manual (form 10009367, 04/2011; covers HCWB3-12, -12K, -12A, -12AK, HCWB3-17, -17K, -17A, -17AK, HCWP3-18 and HCWP3-18A), linked from lennox.com's current HCWB17 and HCWP18 pages, PDF p5 (power humidifier maintenance, unit with power cord): 'Replace humidifier pad annually or if performance of the humidifier drops. (Catalog No. X2661)'

How many

  1. lennox.com Maker's own page checked Oct 1, 2026
    Lennox Healthy Climate humidifier operating manual (form 10009367, 04/2011; covers HCWB3-12, -12K, -12A, -12AK, HCWB3-17, -17K, -17A, -17AK, HCWP3-18 and HCWP3-18A), linked from lennox.com's current HCWB17 and HCWP18 pages, maintenance steps slide the single humidifier pad out of the scale control insert and insert a new one

How often

  1. lennox.com Maker's own page checked Oct 1, 2026
    Lennox Healthy Climate humidifier operating manual (form 10009367, 04/2011; covers HCWB3-12, -12K, -12A, -12AK, HCWB3-17, -17K, -17A, -17AK, HCWP3-18 and HCWP3-18A), linked from lennox.com's current HCWB17 and HCWP18 pages, PDF p4: 'For best performance, you should replace the humidifier pad in your humidifier at least annually' ... 'Replace Humidifier Pad annually or if performance drops'

Size

  1. lennoxpros.com Maker's own page checked Oct 1, 2026
    Additional Information 10" W x 13" H x 1-3/4" D